DEFINITIONS

(1) SOLVATION:
                              The process in which solvent molecules surround and interact with solute ions or molecules is called solvation of the solute .

(2) CRYSTALLIZATION:    
                                            When a solution of a compound is concentrated by evaporation of the solvent and then allowed to cool, the solute separates in the form of crystals.The process is called crystallization.

(3) HYDRATED ION:
                                     An ion surrounded by water molecules in an aqueous solution is called hydrated ion.
                     A hydrated ion is surrounded by one or more water molecules.The number of water molecules surrounding an ion depends upon the size and magnitude of charge on the ion e.g Al+++ ion is hydrated easily as compared to CL-.

(4) HYDRATE:
                          When aqueous solution of any salt is evaporated the crystals of the salt separate out with a definite number of water molecules.
                                                                     Such crystalline substances are called Hydrates e.g. MgCl2.6H2O , CuSO4.5H2O and BaCl2.2H2O etc.